Program 330: Check whether all Characters from String 1 matches String 2

Program 330: Check whether all Characters from String 1 matches String 2

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main()
{
 int i,j,flag;
 char s1[100],s2[100];
 printf("Enter String 1 to check whether all characters are present in Second String or not and is Case Sensitive\n");
 gets(s1);
 printf("Enter String 2\n");
 gets(s2);
 for(i=0;i<strlen(s1);i++)
 {
  flag=0;
  for(j=0;j<strlen(s2);j++)
  {
   if(s1[i]==s2[j])
   {
    flag=1;
    break; 
   }
  }
  if(flag!=1)
  {
   printf("The characters in String 1 are not matching in String 2\n");
   exit(0);
  }
  
 }
 printf("All characters in String1 matches String 2\n");
 return 0;
}

Explanation:

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Output: